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mythicbeasts.go
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mythicbeasts.go
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// Package mythicbeasts implements a DNS provider for solving the DNS-01 challenge using Mythic Beasts API.
package mythicbeasts
import (
"errors"
"fmt"
"net/http"
"net/url"
"time"
"github.com/fibbs/lego/v4/challenge/dns01"
"github.com/fibbs/lego/v4/platform/config/env"
)
// Environment variables names.
const (
envNamespace = "MYTHICBEASTS_"
EnvUserName = envNamespace + "USERNAME"
EnvPassword = envNamespace + "PASSWORD"
EnvAPIEndpoint = envNamespace + "API_ENDPOINT"
EnvAuthAPIEndpoint = envNamespace + "AUTH_API_ENDPOINT"
EnvTTL = envNamespace + "TTL"
EnvPropagationTimeout = envNamespace + "PROPAGATION_TIMEOUT"
EnvPollingInterval = envNamespace + "POLLING_INTERVAL"
EnvHTTPTimeout = envNamespace + "HTTP_TIMEOUT"
)
// Config is used to configure the creation of the DNSProvider.
type Config struct {
UserName string
Password string
HTTPClient *http.Client
PropagationTimeout time.Duration
PollingInterval time.Duration
APIEndpoint *url.URL
AuthAPIEndpoint *url.URL
TTL int
}
// NewDefaultConfig returns a default configuration for the DNSProvider.
func NewDefaultConfig() (*Config, error) {
apiEndpoint, err := url.Parse(env.GetOrDefaultString(EnvAPIEndpoint, apiBaseURL))
if err != nil {
return nil, fmt.Errorf("mythicbeasts: Unable to parse API URL: %w", err)
}
authEndpoint, err := url.Parse(env.GetOrDefaultString(EnvAuthAPIEndpoint, authBaseURL))
if err != nil {
return nil, fmt.Errorf("mythicbeasts: Unable to parse AUTH API URL: %w", err)
}
return &Config{
TTL: env.GetOrDefaultInt(EnvTTL, dns01.DefaultTTL),
PropagationTimeout: env.GetOrDefaultSecond(EnvPropagationTimeout, dns01.DefaultPropagationTimeout),
PollingInterval: env.GetOrDefaultSecond(EnvPollingInterval, dns01.DefaultPollingInterval),
APIEndpoint: apiEndpoint,
AuthAPIEndpoint: authEndpoint,
HTTPClient: &http.Client{
Timeout: env.GetOrDefaultSecond(EnvHTTPTimeout, 10*time.Second),
},
}, nil
}
// DNSProvider implements the challenge.Provider interface.
type DNSProvider struct {
config *Config
token string
}
// NewDNSProvider returns a DNSProvider instance configured for mythicbeasts DNSv2 API.
// Credentials must be passed in the environment variables:
// MYTHICBEASTS_USERNAME and MYTHICBEASTS_PASSWORD.
func NewDNSProvider() (*DNSProvider, error) {
values, err := env.Get(EnvUserName, EnvPassword)
if err != nil {
return nil, fmt.Errorf("mythicbeasts: %w", err)
}
config, err := NewDefaultConfig()
if err != nil {
return nil, fmt.Errorf("mythicbeasts: %w", err)
}
config.UserName = values[EnvUserName]
config.Password = values[EnvPassword]
return NewDNSProviderConfig(config)
}
// NewDNSProviderConfig return a DNSProvider instance configured for mythicbeasts DNSv2 API.
func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
if config == nil {
return nil, errors.New("mythicbeasts: the configuration of the DNS provider is nil")
}
if config.UserName == "" || config.Password == "" {
return nil, errors.New("mythicbeasts: incomplete credentials, missing username and/or password")
}
return &DNSProvider{config: config}, nil
}
// Present creates a TXT record using the specified parameters.
func (d *DNSProvider) Present(domain, token, keyAuth string) error {
fqdn, value := dns01.GetRecord(domain, keyAuth)
authZone, err := dns01.FindZoneByFqdn(fqdn)
if err != nil {
return fmt.Errorf("mythicbeasts: %w", err)
}
leaf := fqdn[:len(fqdn)-(len(authZone)+1)]
authZone = dns01.UnFqdn(authZone)
err = d.login()
if err != nil {
return fmt.Errorf("mythicbeasts: %w", err)
}
err = d.createTXTRecord(authZone, leaf, value)
if err != nil {
return fmt.Errorf("mythicbeasts: %w", err)
}
return nil
}
// CleanUp removes the TXT record matching the specified parameters.
func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
fqdn, value := dns01.GetRecord(domain, keyAuth)
authZone, err := dns01.FindZoneByFqdn(fqdn)
if err != nil {
return fmt.Errorf("mythicbeasts: %w", err)
}
leaf := fqdn[:len(fqdn)-(len(authZone)+1)]
authZone = dns01.UnFqdn(authZone)
err = d.login()
if err != nil {
return fmt.Errorf("mythicbeasts: %w", err)
}
err = d.removeTXTRecord(authZone, leaf, value)
if err != nil {
return fmt.Errorf("mythicbeasts: %w", err)
}
return nil
}
// Timeout returns the timeout and interval to use when checking for DNS propagation.
// Adjusting here to cope with spikes in propagation times.
func (d *DNSProvider) Timeout() (timeout, interval time.Duration) {
return d.config.PropagationTimeout, d.config.PollingInterval
}